How are old solar panels dispose of?

They can be sold as ‘refurbished’ panels to residential customers at a reduced price, or they can be recycled and sold for scrap metal. Most solar companies guarantee to carry out the disposal themselves. Many of the elements of a solar cell (such as glass, polymer, aluminum, copper, and semiconductor materials) can also be safely disposed of in a landfill.

Supporting Materials

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Shining the Light on Solar Panel Recycling
Solar Panel Life Cycle
Environmental Review of Solar Farms
Landfilling Old Solar Panels Likely Safe for Humans, New Research Suggests
Health and Safety Impacts of Solar Photovoltaics